main()
{
    int n,i,un1,un2,un;
    for (n=2;n<3; )
    {
        printf("please enter required number of generation:");
        scanf ("%d",&n);
        if ( n < 3 ) printf ("\n Enter error ! \n");
    }

    un=un2=1;
    printf ("The repid increase of rabbits in first %d generations is as felow:\n",n);
    printf("1\t1\t");
    for ( i=3; i<=n;i++)
    {
        un1 = un2;
        un2 = un;
        un = un1 + un2;
        printf (i%10 ? "%d\t" : "%d\n" , un );
    }
    printf("\n");
}